Discrimination Judgments of Frequency-Modulated Tones

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Description

Three subjects were repeatedly presented with all possible pairs of nine
frequency-modulated (FM) tones. The tones had one out of nine different
modulation rates, a random modulation phase, a duration of 500 ms, a sound
pressure level of 60 dB, and a center frequency of 1000 Hz.

On each trial, subjects judged whether the two FM tones sounded same or
different.